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But since sin 0 is a periodic function of 6 with a period of 2 T, we have
sin 6= sin (<9+27r),
therefore             x = a sin [w (J + P) + 5 ]
= a sin [&rf+5+2ir]
and consequently
231.   Frequency.  The  number  of  complete vibrations which the particle makes per second is called the frequency of the vibration.    If n denotes the frequency, then
n-i-.                (V)
232.   Time-distance Diagram.  Suppose the  particle  to describe the vertical line A A', Fig. 131, the middle point of
FIG. 131.
which is the fixed point. Then OA = OA! = a = the amplitude. The relation between the position of the particle and the time may be visualized by plotting equation (III) with x as ordinate and t as abscissa. This gives the well-known sine curve.
A mental picture of the motion of "the particle may be formed by supposing that the particle under consideration is a projection of another particle which moves in a circle of radius a with a constant speed. The second particle and its path may be called the auxiliary particle and the auxiliary j respectively.